Claytonia sibirica, Impatiens glandulifera and some other alien garden plants in Selje municipality, Sogn og Fjordane county.
Invasive alien species are spreading at an increasing speed in Norwegian nature, and both well-known and new species still find new habitats. Knowledge about the history of an area one can often help explain the occurrence of many alien species. Claytonia sibirica is a small garden plant that was previously classified as an alien with potential high (PH) ecological risk, but in 2018 it was reclassified as a high risk (HI) species. Claytonia sibirica was found in the spring of 2017 in Selje as a new invasive alien species. Other garden plants that appear to increase in numbers in this coastal municipality include Impatiens glandulifera and Reynoutria japonica in addition to the well-established trees Acer pseudoplatanus and Picea sitchensis. Invasive alien species have become a problem not only in nature reserves and other protected areas, but also in valuable cultural landscapes. Here, they affect important cultural heritage sites, cultural monuments and landscapes as well as natural values. A closer cooperation between nature and culture administration is desirable.